High-frequency cylindrical magnetic cloaks with thin layer structure.
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| Title: | High-frequency cylindrical magnetic cloaks with thin layer structure. |
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| Authors: | Steckiewicz, Adam1 (AUTHOR) a.steckiewicz@pb.edu.pl |
| Source: | Journal of Magnetism & Magnetic Materials. Sep2021, Vol. 534, pN.PAG-N.PAG. 1p. |
| Subjects: | Copper films, Magnetic fields, Ferromagnetic materials, Conducting polymers, Electric conductivity, Polytef |
| Abstract: | • Broadband cloaks for harmonic magnetic fields can be made using isotropic materials. • Analytical formula for permeability required to achieve cloaking effect is presented. • Bandwidth of the cloak may be changed by adjusting the conductivity of an inner layer. • It is possible to find this bandwidth using introduced concept of cloaking frequency. The article presents a design methodology of a thin layer, high-frequency cylindrical invisibility cloak intended for quasi-static magnetic fields. The proposed bilayer structure of a cloaking shell is synthesized using isotropic ferromagnetic and conductive materials. An analytical formula is derived to find the properties of a ferromagnetic layer in the wide frequency spectrum of an external time-harmonic magnetic field. The cloaking properties of the shell can be adjusted by the selection of conductive materials and estimated using an introduced formula. Analytical calculations are accompanied with numerical results of exemplary cloaking structures. The thin layer structures are able to maintain cloaking effect from a specific frequency, up to high frequencies of the magnetic field as long as displacement currents can be neglected. Additionally, the results of an experimental verification of the broadband magnetic cloak efficiency are reported. The cloaking shell composed of ferromagnetic polymer and conductive materials is subjected to the time-harmonic magnetic field. Three samples are presented and the magnetic field distortion, measured in the background area, is discussed. In order to obtain a desired effective electrical conductivity, a method of fabricating conductive layer, utilizing copper film on polytetrafluoroethylene base, is used. The experimental results are compared with both 3D and 2D numerical model of the cloak. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 150968751 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: High-frequency cylindrical magnetic cloaks with thin layer structure. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Steckiewicz%2C+Adam%22">Steckiewicz, Adam</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> a.steckiewicz@pb.edu.pl</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Magnetism+%26+Magnetic+Materials%22">Journal of Magnetism & Magnetic Materials</searchLink>. Sep2021, Vol. 534, pN.PAG-N.PAG. 1p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Copper+films%22">Copper films</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fields%22">Magnetic fields</searchLink><br /><searchLink fieldCode="DE" term="%22Ferromagnetic+materials%22">Ferromagnetic materials</searchLink><br /><searchLink fieldCode="DE" term="%22Conducting+polymers%22">Conducting polymers</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+conductivity%22">Electric conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Polytef%22">Polytef</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: • Broadband cloaks for harmonic magnetic fields can be made using isotropic materials. • Analytical formula for permeability required to achieve cloaking effect is presented. • Bandwidth of the cloak may be changed by adjusting the conductivity of an inner layer. • It is possible to find this bandwidth using introduced concept of cloaking frequency. The article presents a design methodology of a thin layer, high-frequency cylindrical invisibility cloak intended for quasi-static magnetic fields. The proposed bilayer structure of a cloaking shell is synthesized using isotropic ferromagnetic and conductive materials. An analytical formula is derived to find the properties of a ferromagnetic layer in the wide frequency spectrum of an external time-harmonic magnetic field. The cloaking properties of the shell can be adjusted by the selection of conductive materials and estimated using an introduced formula. Analytical calculations are accompanied with numerical results of exemplary cloaking structures. The thin layer structures are able to maintain cloaking effect from a specific frequency, up to high frequencies of the magnetic field as long as displacement currents can be neglected. Additionally, the results of an experimental verification of the broadband magnetic cloak efficiency are reported. The cloaking shell composed of ferromagnetic polymer and conductive materials is subjected to the time-harmonic magnetic field. Three samples are presented and the magnetic field distortion, measured in the background area, is discussed. In order to obtain a desired effective electrical conductivity, a method of fabricating conductive layer, utilizing copper film on polytetrafluoroethylene base, is used. The experimental results are compared with both 3D and 2D numerical model of the cloak. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Magnetism & Magnetic Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jmmm.2021.168039 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: N.PAG Subjects: – SubjectFull: Copper films Type: general – SubjectFull: Magnetic fields Type: general – SubjectFull: Ferromagnetic materials Type: general – SubjectFull: Conducting polymers Type: general – SubjectFull: Electric conductivity Type: general – SubjectFull: Polytef Type: general Titles: – TitleFull: High-frequency cylindrical magnetic cloaks with thin layer structure. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Steckiewicz, Adam IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 09 Text: Sep2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 03048853 Numbering: – Type: volume Value: 534 Titles: – TitleFull: Journal of Magnetism & Magnetic Materials Type: main |
| ResultId | 1 |
